When does count time operation starts using Prescaler and timer 1?

Question:

Answer:

Count starts from the first rising edge of the count source (2) after prescaler and timer 1 operations start (1).
Subject to the operation start timing of the timers and count source, after count starts, the time to the first underflow (3) will be (up to one count period) shorter than the time between subsequent underflows (4).
When CNTR input is selected as the count source of timer 1, timer 1 operates in synchronization with the falling edge of CNTR input. (#105075)